condition mean min max ZT0-3 164.30898 164.30898 164.30898 ZT4-7 348.5046665 348.5046665 348.5046665 ZT8-11 346.9267565 346.9267565 346.9267565 ZT12-15 335.2233105 335.2233105 335.2233105 ZT16-19 232.3632135 232.3632135 232.3632135 ZT20-23 229.1436155 229.1436155 229.1436155